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It could be still, my vivid does not really have yellow polyps in my tank but it does in other tanks. However if we do not know what it is we should not guess.

Yes a photo would be very helpful.

Looking good!

The garf looks a little funny to me. Maybe it's just the angle.

With that I'd imagine it would be hard to get the light pointed horizontal and hold really any weight at all.

I have the tck master torch.

I cannot stress this enough but I have run a CaRx for years. Try to time it with your lighting cycle. Your tank will not consume alk when the light are out. The pH also drops when the lights are out because your coral do not consume CO2 during this time.

I have never soaked my media before adding to my reactor.

This is mine running a CaRx. It's only on during the photoperiod.

They deffinetly do. Feed less for now, or do more water changes.

Feeding does contribute, it increases nutrients in the water.

I've done both calcium reactors and 2/3 part. Once dialed in a calcium reactor is much easier to operate.

Yes

You can tune them much finer in regards to bubble rate. I don't run a pH probe because of this.

Both

I just don't run my CaRx when my lights are off. This way it affect the pH less. Typically your corals are not consuming the Ca or Alk when the lights are off.

So, the way I have mine controlled, the CaRx peristaltic pump and CO2 are only allowed to be on during the lighting period. But my apex will turn off both if the dkH is over 8.

I actually have these parker metering valves that are much better than the swagelok. I don't think that is what I gave Boun though. hahaha

I've been doing it like this for a few years now. If my numbers ever look very off I switch to manual until I can fix it.

For regulators, a good dual stage is a better choice. I think I have a bunch of parts still if you need any to build one.